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https://issues.apache.org/jira/browse/JEXL-297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Biestro closed JEXL-297.
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> validate expression (instead of evaluate)
> -----------------------------------------
>
> Key: JEXL-297
> URL: https://issues.apache.org/jira/browse/JEXL-297
> Project: Commons JEXL
> Issue Type: New Feature
> Affects Versions: 3.1
> Reporter: Sharon Ben Asher
> Priority: Minor
>
> My project uses JEXL to both validate and evaluate expressions.
> Let me explain:
> The product has an excel-like feature and two stages:
> In the "design" stage, a user may enter a literal OR a formula in input
> fields. fields are either numeric-typed or boolean-typed, so an expression
> may be numeric or boolean. the expressions may contain variables. In the
> "production" stage, the expressions are evaluated. variables get values from
> the DB.
> During the design, we are validating the expressions and alert the user if
> there are syntax errors. at that time, validation is using JEXL to evaluate
> the expression and examines the result for exceptions or error responses. the
> variables are assigned some default value.
> The problem I am having is to come up with default values that will not cause
> errors not related to syntax (like division by zero) I am encountering all
> kinds of arithmetic exceptions that are because of values and not because of
> syntax.
> So perhaps JEXL can support "syntax validation" feature, where variables can
> be "any value that is valid at this position"
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